A small electric drive device suitable for vacuum valves

Abstract

The present application relates to the field of uranium enrichment equipment, and more particularly to a small electric drive device suitable for vacuum valves. The device comprises: the left and right ends and the lower part of the frame are provided with openings, the screw rod is limited in movement stroke by the left and right top wires, the speed reducer is connected with the motor and the gear set respectively, the gear set is engaged with the screw rod after reversing; the yoke sleeve is coaxially arranged with the screw rod and is limited by the left shaft shoulder, the yoke sleeve is connected with the screw rod through the sliding block, the yoke sleeve is coaxially sleeved on the screw rod in sequence with the thrust bearing, the disc spring and the limiting nut, and is fixed through the rightmost nut; the limiting nut and the bushing are fixed with the frame through the positioning screw; the left end of the frame is sealed through the stop end cover I, the bearing I and the bearing II are fixed with the frame, the right end of the frame is sealed through the stop end cover II, the axial limitation of the right top wire is realized after the locking of the stop end cover II, and the upper part of the frame is visible; the pointer is fixed on the yoke sleeve. The present application has small structure and stronger applicability.

Description

Technical Field

[0001] This invention relates to the field of uranium enrichment equipment, and more particularly to a small electric drive device suitable for vacuum valves. Background Technology

[0002] Vacuum valves are crucial equipment in uranium enrichment systems. Vacuum valves come in various structural forms, including pneumatic stop valves, pneumatic flap valves, pneumatic butterfly valves, manual slide gate valves, electromagnetic vacuum shut-off valves, diaphragm vacuum valves, ultra-high vacuum angle valves, three-way ultra-high vacuum valves, fine-tuning vacuum valves, bellows vacuum shut-off valves, torpedo vacuum valves, rotary vacuum valves, jacketed Y-type vacuum shut-off valves, high-vacuum fine-tuning vacuum valves, electromagnetic pneumatic vacuum valves, and diaphragm-type high-pressure high-vacuum valves. Vacuum valves are available in both pneumatic and manual actuation methods.

[0003] Currently, the vacuum valves used in the system employ a worm gear reduction mechanism. This transmission method results in the motor being arranged perpendicularly to the process piping, leading to a large size of the electric drive unit. The process piping is not compact enough to avoid the valves. Furthermore, in the new system with limited space, the large size of the valves makes it impossible to place them, affecting the normal arrangement of piping and supports. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a small electric drive device suitable for vacuum valves. This electric drive device can not only realize the requirements of rapid opening and closing of valves and provide sufficient sealing torque, but also has a small size and stable and reliable performance.

[0005] This invention provides a small electric drive device suitable for vacuum valves, comprising:

[0006] The frame has openings at both ends and at the bottom.

[0007] The lead screw limits the movement stroke through the left and right set screws.

[0008] The speed reducer is connected to the motor and gear set via its front and rear shafts, respectively. After a 180° reversal, the gear set meshes with the lead screw.

[0009] The connecting fork sleeve is arranged coaxially with the lead screw and is limited by the left shoulder. The connecting fork sleeve and the lead screw are connected by a slider. The connecting fork sleeve is coaxially sleeved on the lead screw with the thrust bearing, disc spring and limit nut in sequence, and is fixed by the rightmost nut; the right side of the right nut is the right set screw.

[0010] The limit nut and bushing are fixed to the frame by positioning screws;

[0011] The left end of the frame is sealed by a stop end cover I. Bearings I and II are both fixed to the frame and are used to support the gear set and enable its flexible operation. Bearing I is axially limited by the stop end cover I, and bearing II is axially limited by the thrust ring.

[0012] The right end of the frame is sealed by stop end cover II. After stop end cover II is locked, the right set screw is axially limited.

[0013] A visible area is provided at the top of the rack;

[0014] The pointer is fixed on the fork sleeve and displayed within the visible area.

[0015] Preferably, the motor is a low-voltage DC motor with an output speed of 3000 r / min; the reducer is a planetary reducer with two-stage reduction and a reduction ratio of 28.05; the gear set is an involute standard cylindrical spur gear, which only serves to reverse direction and has a reduction ratio of 1.

[0016] The motor and reducer are directly connected.

[0017] Preferably, a washer is provided between the limiting nut and the right-side nut.

[0018] Preferably, the frame has an opening at the top, and a transparent glass cover is installed in the area of ​​the opening at the top of the housing.

[0019] Preferably, the bearing I is fixed in the following way: one end adopts a threaded stop end cover I, and the stop is achieved by slotting the side of the stop end cover I with external threads and tightening it with screws; the other end has a thrust ring divided into four parts in the circumferential direction.

[0020] Preferably, the right top screw passes through the stop end cap II.

[0021] Preferably, the pointer is fixed to the connecting fork sleeve by a threaded connection, and the connecting fork sleeve is connected to the valve core connector, so as to accurately indicate the stroke by the position of the valve core movement.

[0022] Preferably, the stop end cover I, after being locked by screw I, is used for axial positioning of bearing I.

[0023] Preferably, the non-load-bearing parts of the frame are provided with cutouts.

[0024] Preferably, the stop end cap II, after being locked by screw II, is used for axial positioning of the right set screw.

[0025] Compared with existing technologies, the miniature electric drive device for vacuum valves of this invention, through the rational design of the reduction mechanism, lead screw mechanism, frame structure, and the installation and positioning methods of components such as bearings and pointers, achieves a compact structure, light weight, and convenient installation while ensuring opening and closing time and smooth closure, thus solving the installation problem in limited spaces. The vacuum valve with this structure has passed opening and closing action tests in various orientations and meets the system application requirements. Attached Figure Description

[0026] Figure 1 A schematic diagram showing the structure of a small electric drive device suitable for vacuum valves;

[0027] Figure 2 A side view of the rack;

[0028] Figure 3 A top view of the frame;

[0029] Figure 4 This is a schematic diagram of the lead screw mechanism.

[0030] Figure 5 This diagram shows the structure of the thrust ring.

[0031] In the picture,

[0032] 1-Left set screw, 2-Screw I, 3-Stop end cover I, 4-Bearing I, 5-Frame, 6-Gear set, 7-Bearing II, 8-Thrust ring, 9-Limit switch, 10-Pointer, 11-Lead screw, 12-Bushing, 13-Stop end cover II, 14-Positioning screw, 15-Screw II, 16-Right set screw, 17-Reducer, 18-Motor, 19-Connecting fork sleeve, 20-Thrust bearing, 21-Disc spring, 22-Limit nut, 23-Washer, 24-Right nut. Detailed Implementation

[0033] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0034] Embodiments of the present invention disclose a small electric drive device suitable for vacuum valves, such as... Figure 1 As shown, it includes:

[0035] like Figure 2 and 3 As shown, the frame 5 has openings at both ends and at the bottom.

[0036] The reducer 17 is connected to the motor 18 and the gear set 6 via its front and rear shafts respectively. After the gear set 6 reverses direction by 180°, it meshes with the trapezoidal thread of the lead screw 11, driving the lead screw mechanism to move.

[0037] The motor 18 and the reducer 17 are directly connected. The motor is a low-voltage DC motor with an output speed of 3000 r / min. The reducer is a planetary reducer with two-stage reduction and a reduction ratio of 28.05. The gear set is an involute standard cylindrical spur gear, which only serves to reverse direction and has a reduction ratio of 1.

[0038] According to the present invention, the motor 18 and the reducer 17 constitute a reduction mechanism. The DC motor, paired with a planetary gear reducer, drives the lead screw mechanism to move back and forth through gear reversal, and drives the valve core to swing back and forth through a connecting member, thereby opening and closing the valve. A pointer is fixed on the lead screw assembly; as the valve core swings, it touches a limit switch, outputting a switch signal. The reduction mechanism can provide the required closing torque for the valve and reduces the electric drive device through gear reversal. Simultaneously, arranging the motor 18 and reducer 17 parallel to the pipeline facilitates pipeline layout.

[0039] The lead screw 11 limits the movement stroke through the left set screw 1 and the right set screw 16.

[0040] The connecting fork sleeve 19 is coaxially arranged with the lead screw 11 and is limited by the left shoulder. The connecting fork sleeve 19 and the lead screw 11 are connected by a slider. The connecting fork sleeve 19 is coaxially sleeved on the lead screw 11 with the thrust bearing 20, disc spring 21 and limit nut 22 in sequence, and is fixed by the rightmost nut 24. The right side of the right nut 24 is the right top screw 16.

[0041] The lead screw mechanism consists of a lead screw 11, a connecting fork sleeve 19 fitted on the lead screw, a thrust bearing 20, a disc spring 21, a limit nut 22, a washer 23, and a right-side nut 24. Its function is to convert the rotary motion output by the reduction mechanism into linear motion. The lead screw is self-locking. The connecting fork sleeve 19 drives the valve core to swing through the valve core's connecting parts, thus opening and closing the valve. The disc spring 21 is pre-compressed through the limit nut bushing 22, washer 23, and right-side nut 24, generating partial sealing force in advance to control the lead screw's stroke and reduce the need for an electric drive. Simultaneously, the disc spring 21 provides continuous sealing force after the valve is closed and the motor stops, ensuring a continuous and effective seal. The structure of the lead screw mechanism is shown below. Figure 4 .

[0042] The limit nut 22 and bushing 12 are fixed to the frame 5 by the positioning screw 14, which restricts the rotational movement of the lead screw mechanism, allowing the lead screw mechanism to move back and forth, converting the rotational motion output by the reducer 17 into the linear motion of the lead screw. The connecting piece transmits the force to the valve core through the connecting fork sleeve 19, causing the valve core to swing back and forth, and the valve to open and close.

[0043] The left end of the frame 5 is sealed by the stop end cover I3. Bearing I4 and bearing II7 are both fixed to the frame 5 to support the gear set 6 and enable the gear set 6 to rotate flexibly. After the bearing I4 is locked by the screw I2, it is used to limit the axial movement of the stop end cover I3. The bearing II7 is axially limited by the thrust ring 8.

[0044] Specifically, the bearing I 4 is fixed as follows: one end uses a threaded stop cap I 3, which is slotted on the side and secured with screws to achieve stopping; the other end has a thrust ring 8 divided into four parts circumferentially. This method is compact and can effectively fix bearing I 4 and bearing II 7. See details. Figure 5 .

[0045] The right end of frame 5 is sealed by stop end cover II 13. After stop end cover II 13 is locked, the right set screw 16 is axially limited.

[0046] After the stop end cap II 13 is locked by the screw II 15, it is used for axial positioning of the right set screw 16, which passes through the stop end cap II 13;

[0047] A visible area is provided on the upper part of the frame 5; the visible area can be a hole, and a transparent glass cover is installed in the area with the hole.

[0048] Pointer 10 is fixed on the fork sleeve 19 and is displayed within the visible area.

[0049] The pointer 10 is fixed to the connecting fork sleeve 19 by a threaded connection. The connecting fork sleeve 19 is connected to the valve core connector, and the stroke is accurately indicated by the position of the valve core movement. This structure is simple, convenient, and highly reliable.

[0050] The connecting fork sleeve 19 is a transitional component connecting the motor drive device and the valve core movement. It can transmit the movement stroke of the valve core to the pointer 10 through the connecting component. The pointer 10 controls the motor to turn on and off by touching the limit switch 9 to realize the opening and closing of the valve. The left set screw 1 and right set screw 16 are set in front and behind the lead screw to limit the mechanical movement of the lead screw mechanism, so as to provide mechanical protection for the electric drive device in case of signal loss or loss of control.

[0051] In this invention, the frame 5 is made of stainless steel precision casting. To reduce weight, except for necessary support and protection such as bearing I 4, bearing II 7, bushing 12, gear set 6, etc., other non-load-bearing parts of the frame are hollowed out, and the exposed parts are covered by the motor, so as to make the frame lightweight.

[0052] This invention relates to a small electrically driven device, which is part of a nuclear vacuum valve. Such valves are crucial equipment in uranium hexafluoride systems used in uranium enrichment. They are primarily used in centrifuge plants for both the units and inter-unit piping. Their main function is to prevent the escalation of an accident by interlocking with the system's accident protection sensors to bypass the unit in the event of an anomaly. This promptly opens the bypass pipeline, cutting off the abnormal part of the system to facilitate accident handling and cascading operations. This electrically driven device meets the requirement of opening and closing the vacuum valve within a specified time, solving the installation problem caused by space constraints. Vacuum valves of this structure have undergone type testing and performed well, and will be applied in engineering projects.

[0053] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A small electric drive device suitable for vacuum valves, characterized in that, include: The frame has openings at both ends and at the bottom. The lead screw limits the movement stroke through the left and right set screws. The speed reducer is connected to the motor and gear set via its front and rear shafts, respectively. After a 180° reversal, the gear set meshes with the lead screw. The connecting fork sleeve is arranged coaxially with the lead screw and is limited by the left shoulder. The connecting fork sleeve and the lead screw are connected by a slider. The connecting fork sleeve is coaxially sleeved on the lead screw with the thrust bearing, disc spring and limit nut in sequence, and is fixed by the rightmost nut; the right side of the right nut is the right set screw. The limit nut and bushing are fixed to the frame by positioning screws; The left end of the frame is sealed by a stop end cover I. Bearings I and II are both fixed to the frame and are used to support the gear set and enable its flexible operation. Bearing I is axially limited by the stop end cover I, and bearing II is axially limited by the thrust ring. The right end of the frame is sealed by stop end cover II. After stop end cover II is locked, the right set screw is axially limited. A visible area is provided at the top of the rack; The pointer is fixed to the fork sleeve and displayed within the visible area; The motor is a low-voltage DC motor with an output speed of 3000 r / min; the reducer is a planetary reducer with two-stage reduction and a reduction ratio of 28.05; the gear set is an involute standard cylindrical spur gear, which only serves the function of reversing and has a reduction ratio of 1; the motor and reducer are directly connected. The bearing I is fixed in the following way: one end adopts a threaded stop end cover I, and the stop is achieved by slotting the side of the stop end cover I with external threads and tightening it with screws; the other end divides the thrust ring into four parts in the circumferential direction. The pointer is fixed to the connecting fork sleeve by a threaded connection. The connecting fork sleeve is connected to the valve core connector and accurately indicates the stroke by the position of the valve core movement.

2. The small electric drive device for vacuum valves according to claim 1, characterized in that, A washer is provided between the limiting nut and the right nut.

3. The small electric drive device for vacuum valves according to claim 1, characterized in that, The frame has an opening at the top, and a transparent glass cover is installed in the area of ​​the opening at the top of the housing.

4. The small electric drive device for vacuum valves according to claim 1, characterized in that, The right top screw passes through the stop end cap II.

5. The small electric drive device for vacuum valves according to claim 1, characterized in that, The stop end cover I, after being locked by screw I, is used for axial positioning of bearing I.

6. The small electric drive device for vacuum valves according to claim 1, characterized in that, The non-load-bearing parts of the frame are hollowed out.

7. The small electric drive device for vacuum valves according to claim 1, characterized in that, The stop end cap II, after being locked by screw II, is used for axial positioning of the right set screw.

Images